[time-nuts] NAVSTAR proteus GPS time and frequency unit
paulswedb at gmail.com
Mon Nov 9 21:43:30 EST 2015
Well for the heck of it I just fired the austron 2201 up. Date was circa
1980 or something way back. Guess the battery went. That said set the date
and time to UTC and let it go. Almanac seems to grab a satellite every now
and then but it does not go into the full track mode.
I normally cheat this with a semi-automatic acquire and give it a list of
know satellites. But will just let it run for a day or so.
Need to watch it this is not my thread.
On Mon, Nov 9, 2015 at 8:11 PM, Graham / KE9H <ke9h.graham at gmail.com> wrote:
> GPS Time ignores (does not deal with) "Leap Seconds."
> It is dealt with in the software translation from GPS time to UTC or local
> That is part of the reason there is a 16 second time difference between GPS
> Time and UTC/local time.
> --- Graham
> On Mon, Nov 9, 2015 at 4:15 PM, Chuck Harris <cfharris at erols.com> wrote:
> > Seems to me that there is more to this than just
> > getting the displayed date wrong.
> > It is true that the date will present wrongly, but
> > what about leap seconds?
> > If the GPS week rolls over at 1024, how will the
> > GPS figure out which is the proper calendar date
> > to apply the leap second?
> > -Chuck Harris
> > Hal Murray wrote:
> >> paulswedb at gmail.com said:
> >>> Hmmm then why do I have to figure it out at all? I don't care what the
> >>> date
> >>> says.
> >> Only that the Austron locks and does its frequency offset compare. It
> >>> would
> >>> be great not to have to do this.
> >> If you don't care about the date, then don't worry about it.
> >> It will do everything it did before. The only glitch is that the date
> >> will
> >> be off by 1024 weeks.
> >> If you can't get the right date into your GPS unit, you can work around
> >> the
> >> issue in software. Just add 1024 weeks to the date until the date is
> >> the build time of your fixup software.
> >> That assumes you have some software to work with. That won't help if
> >> are
> >> using a program that the vendor no longer supports.
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